短語詞組短語unified national coarse thread 統(tǒng)一標準粗牙螺紋unc unified national coarse thread 統(tǒng)一標準粗牙螺紋unified coarse thread series 統(tǒng)一的標準粗牙螺紋系列Unified coarse thread hand taps 統(tǒng)一標準粗牙絲攻 返回 unified coarse thread